X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/6f04e042bc53b073be4592ad529adb45ac59b777..f21c4fc3d7f78879f3ecac4dff751e4888dcac06:/src/msg/gos.c diff --git a/src/msg/gos.c b/src/msg/gos.c index 73967cdcf2..899b135a5e 100644 --- a/src/msg/gos.c +++ b/src/msg/gos.c @@ -1,163 +1,289 @@ -/* $Id$ */ - -/* Copyright (c) 2002-2007 Arnaud Legrand. */ -/* Copyright (c) 2007 Bruno Donassolo. */ -/* All rights reserved. */ +/* Copyright (c) 2004, 2005, 2006, 2007, 2008, 2009, 2010. The SimGrid Team. + * All rights reserved. */ /* This program is free software; you can redistribute it and/or modify it * under the terms of the license (GNU LGPL) which comes with this package. */ -#include "msg/private.h" +#include "private.h" #include "xbt/sysdep.h" +#include "mc/mc.h" #include "xbt/log.h" +#include "mailbox.h" + XBT_LOG_NEW_DEFAULT_SUBCATEGORY(msg_gos, msg, - "Logging specific to MSG (gos)"); + "Logging specific to MSG (gos)"); -/** \defgroup msg_gos_functions MSG Operating System Functions - * \brief This section describes the functions that can be used - * by an agent for handling some task. +/** \ingroup msg_gos_functions + * + * \brief Return the last value returned by a MSG function (except + * MSG_get_errno...). */ - -static MSG_error_t __MSG_task_get_with_time_out_from_host(m_task_t * task, - m_channel_t - channel, - double - max_duration, - m_host_t host) +MSG_error_t MSG_get_errno(void) { + return PROCESS_GET_ERRNO(); +} - m_process_t process = MSG_process_self(); - m_task_t t = NULL; - m_host_t h = NULL; - simdata_task_t t_simdata = NULL; - simdata_host_t h_simdata = NULL; - int first_time = 1; - xbt_fifo_item_t item = NULL; - - smx_cond_t cond = NULL; //conditional wait if the task isn't on the channel yet - +/** \ingroup msg_gos_functions + * \brief Executes a task and waits for its termination. + * + * This function is used for describing the behavior of an agent. It + * takes only one parameter. + * \param task a #m_task_t to execute on the location on which the + agent is running. + * \return #MSG_FATAL if \a task is not properly initialized and + * #MSG_OK otherwise. + */ +MSG_error_t MSG_task_execute(m_task_t task) +{ + simdata_task_t simdata = NULL; + m_process_t self = MSG_process_self(); CHECK_HOST(); - xbt_assert1((channel >= 0) - && (channel < msg_global->max_channel), "Invalid channel %d", - channel); - /* Sanity check */ - xbt_assert0(task, "Null pointer for the task\n"); - if (*task) - CRITICAL0 - ("MSG_task_get() was asked to write in a non empty task struct."); - - /* Get the task */ - h = MSG_host_self(); - h_simdata = h->simdata; - - DEBUG2("Waiting for a task on channel %d (%s)", channel, h->name); - - SIMIX_mutex_lock(h->simdata->mutex); - while (1) { - if (xbt_fifo_size(h_simdata->mbox[channel]) > 0) { - if (!host) { - t = xbt_fifo_shift(h_simdata->mbox[channel]); - break; - } else { - xbt_fifo_foreach(h->simdata->mbox[channel], item, t, m_task_t) { - if (t->simdata->source == host) - break; - } - if (item) { - xbt_fifo_remove_item(h->simdata->mbox[channel], item); - break; - } - } - } + simdata = task->simdata; - if (max_duration > 0) { - if (!first_time) { - SIMIX_mutex_unlock(h->simdata->mutex); - h_simdata->sleeping[channel] = NULL; - SIMIX_cond_destroy(cond); - MSG_RETURN(MSG_TRANSFER_FAILURE); - } - } - xbt_assert1(!(h_simdata->sleeping[channel]), - "A process is already blocked on channel %d", channel); + xbt_assert0(simdata->host_nb == 0, + "This is a parallel task. Go to hell."); - cond = SIMIX_cond_init(); - h_simdata->sleeping[channel] = cond; - if (max_duration > 0) { - SIMIX_cond_wait_timeout(cond, h->simdata->mutex, max_duration); - } else - SIMIX_cond_wait(h_simdata->sleeping[channel], h->simdata->mutex); +#ifdef HAVE_TRACING + TRACE_msg_task_execute_start(task); +#endif - if (SIMIX_host_get_state(h_simdata->s_host) == 0) - MSG_RETURN(MSG_HOST_FAILURE); + xbt_assert1((!simdata->compute) && (task->simdata->refcount == 1), + "This task is executed somewhere else. Go fix your code! %d", + task->simdata->refcount); - first_time = 0; - } - SIMIX_mutex_unlock(h->simdata->mutex); + DEBUG1("Computing on %s", MSG_process_self()->simdata->m_host->name); - DEBUG1("OK, got a task (%s)", t->name); - /* clean conditional */ - if (cond) { - SIMIX_cond_destroy(cond); - h_simdata->sleeping[channel] = NULL; + if (simdata->computation_amount == 0) { +#ifdef HAVE_TRACING + TRACE_msg_task_execute_end(task); +#endif + return MSG_OK; } + simdata->refcount++; + simdata->compute = + SIMIX_req_host_execute(task->name, SIMIX_host_self(), + simdata->computation_amount); + SIMIX_req_host_execution_set_priority(simdata->compute, simdata->priority); +#ifdef HAVE_TRACING + SIMIX_req_set_category(simdata->compute, task->category); +#endif - t_simdata = t->simdata; - t_simdata->receiver = process; - *task = t; - - SIMIX_mutex_lock(t_simdata->mutex); - - /* Transfer */ - t_simdata->using++; - /* create SIMIX action to the communication */ - t_simdata->comm = - SIMIX_action_communicate(t_simdata->sender->simdata->m_host-> - simdata->s_host, - process->simdata->m_host->simdata->s_host, - t->name, t_simdata->message_size, - t_simdata->rate); - /* if the process is suspend, create the action but stop its execution, it will be restart when the sender process resume */ - if (MSG_process_is_suspended(t_simdata->sender)) { - DEBUG1("Process sender (%s) suspended", t_simdata->sender->name); - SIMIX_action_set_priority(t_simdata->comm, 0); - } - process->simdata->waiting_task = t; - SIMIX_register_action_to_condition(t_simdata->comm, t_simdata->cond); - SIMIX_cond_wait(t_simdata->cond, t_simdata->mutex); - process->simdata->waiting_task = NULL; - - /* the task has already finished and the pointer must be null */ - if (t->simdata->sender) { - t->simdata->sender->simdata->waiting_task = NULL; + self->simdata->waiting_action = simdata->compute; + SIMIX_req_host_execution_wait(simdata->compute); + self->simdata->waiting_action = NULL; + + simdata->refcount--; + + DEBUG2("Execution task '%s' finished in state %d", task->name, SIMIX_req_host_execution_get_state(task->simdata->compute)); + if (SIMIX_req_host_execution_get_state(task->simdata->compute) == SIMIX_DONE) { + /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */ + SIMIX_req_host_execution_destroy(task->simdata->compute); + simdata->computation_amount = 0.0; + simdata->comm = NULL; + simdata->compute = NULL; +#ifdef HAVE_TRACING + TRACE_msg_task_execute_end(task); +#endif + MSG_RETURN(MSG_OK); + } else if (SIMIX_req_host_get_state(SIMIX_host_self()) == 0) { + /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */ + SIMIX_req_host_execution_destroy(task->simdata->compute); + simdata->comm = NULL; + simdata->compute = NULL; +#ifdef HAVE_TRACING + TRACE_msg_task_execute_end(task); +#endif + MSG_RETURN(MSG_HOST_FAILURE); + } else { /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */ - //t->simdata->comm = NULL; - //t->simdata->compute = NULL; + SIMIX_req_host_execution_destroy(task->simdata->compute); + simdata->comm = NULL; + simdata->compute = NULL; +#ifdef HAVE_TRACING + TRACE_msg_task_execute_end(task); +#endif + MSG_RETURN(MSG_TASK_CANCELLED); } - /* for this process, don't need to change in get function */ - t->simdata->receiver = NULL; - SIMIX_mutex_unlock(t_simdata->mutex); +} + +/** \ingroup m_task_management + * \brief Creates a new #m_task_t (a parallel one....). + * + * A constructor for #m_task_t taking six arguments and returning the + corresponding object. + * \param name a name for the object. It is for user-level information + and can be NULL. + * \param host_nb the number of hosts implied in the parallel task. + * \param host_list an array of \p host_nb m_host_t. + * \param computation_amount an array of \p host_nb + doubles. computation_amount[i] is the total number of operations + that have to be performed on host_list[i]. + * \param communication_amount an array of \p host_nb* \p host_nb doubles. + * \param data a pointer to any data may want to attach to the new + object. It is for user-level information and can be NULL. It can + be retrieved with the function \ref MSG_task_get_data. + * \see m_task_t + * \return The new corresponding object. + */ +m_task_t +MSG_parallel_task_create(const char *name, int host_nb, + const m_host_t * host_list, + double *computation_amount, + double *communication_amount, void *data) +{ + int i; + simdata_task_t simdata = xbt_new0(s_simdata_task_t, 1); + m_task_t task = xbt_new0(s_m_task_t, 1); + task->simdata = simdata; + + /* Task structure */ + task->name = xbt_strdup(name); + task->data = data; + + /* Simulator Data */ + simdata->computation_amount = 0; + simdata->message_size = 0; + simdata->compute = NULL; + simdata->comm = NULL; + simdata->rate = -1.0; + simdata->refcount = 1; + simdata->sender = NULL; + simdata->receiver = NULL; + simdata->source = NULL; + + simdata->host_nb = host_nb; + simdata->host_list = xbt_new0(smx_host_t, host_nb); + simdata->comp_amount = computation_amount; + simdata->comm_amount = communication_amount; + + for (i = 0; i < host_nb; i++) + simdata->host_list[i] = host_list[i]->simdata->smx_host; + + return task; +} + +MSG_error_t MSG_parallel_task_execute(m_task_t task) +{ + simdata_task_t simdata = NULL; + m_process_t self = MSG_process_self(); + CHECK_HOST(); + + simdata = task->simdata; + + xbt_assert0((!simdata->compute) + && (task->simdata->refcount == 1), + "This task is executed somewhere else. Go fix your code!"); + + xbt_assert0(simdata->host_nb, + "This is not a parallel task. Go to hell."); + + DEBUG1("Parallel computing on %s", MSG_process_self()->simdata->m_host->name); + + simdata->refcount++; + + simdata->compute = + SIMIX_req_host_parallel_execute(task->name, simdata->host_nb, + simdata->host_list, + simdata->comp_amount, + simdata->comm_amount, 1.0, -1.0); + DEBUG1("Parallel execution action created: %p", simdata->compute); + + self->simdata->waiting_action = simdata->compute; + SIMIX_req_host_execution_wait(simdata->compute); + self->simdata->waiting_action = NULL; + DEBUG2("Finished waiting for execution of action %p, state = %d", simdata->compute, SIMIX_req_host_execution_get_state(task->simdata->compute)); - if (SIMIX_action_get_state(t_simdata->comm) == SURF_ACTION_DONE) { - //t_simdata->comm = NULL; - SIMIX_action_destroy(t_simdata->comm); - t_simdata->comm = NULL; + simdata->refcount--; + + if (SIMIX_req_host_execution_get_state(task->simdata->compute) == SIMIX_DONE) { + /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */ + SIMIX_req_host_execution_destroy(task->simdata->compute); + simdata->computation_amount = 0.0; + simdata->comm = NULL; + simdata->compute = NULL; MSG_RETURN(MSG_OK); - } else if (SIMIX_host_get_state(h_simdata->s_host) == 0) { - //t_simdata->comm = NULL; - SIMIX_action_destroy(t_simdata->comm); - t_simdata->comm = NULL; + } else if (SIMIX_req_host_get_state(SIMIX_host_self()) == 0) { + /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */ + SIMIX_req_host_execution_destroy(task->simdata->compute); + simdata->comm = NULL; + simdata->compute = NULL; MSG_RETURN(MSG_HOST_FAILURE); } else { - //t_simdata->comm = NULL; - SIMIX_action_destroy(t_simdata->comm); - t_simdata->comm = NULL; - MSG_RETURN(MSG_TRANSFER_FAILURE); + /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */ + SIMIX_req_host_execution_destroy(task->simdata->compute); + simdata->comm = NULL; + simdata->compute = NULL; + MSG_RETURN(MSG_TASK_CANCELLED); } +} + +/** \ingroup msg_gos_functions + * \brief Sleep for the specified number of seconds + * + * Makes the current process sleep until \a time seconds have elapsed. + * + * \param nb_sec a number of second + */ +MSG_error_t MSG_process_sleep(double nb_sec) +{ + e_smx_state_t state; + /*m_process_t proc = MSG_process_self();*/ + +#ifdef HAVE_TRACING + TRACE_msg_process_sleep_in(MSG_process_self()); +#endif + + /* create action to sleep */ + state = SIMIX_req_process_sleep(nb_sec); + + /*proc->simdata->waiting_action = act_sleep; + + FIXME: check if not setting the waiting_action breaks something on msg + + proc->simdata->waiting_action = NULL;*/ + + if (state == SIMIX_DONE) { + if (SIMIX_req_host_get_state(SIMIX_host_self()) == SURF_RESOURCE_OFF) { +#ifdef HAVE_TRACING + TRACE_msg_process_sleep_out(MSG_process_self()); +#endif + MSG_RETURN(MSG_HOST_FAILURE); + } + } else { +#ifdef HAVE_TRACING + TRACE_msg_process_sleep_out(MSG_process_self()); +#endif + MSG_RETURN(MSG_HOST_FAILURE); + } +#ifdef HAVE_TRACING + TRACE_msg_process_sleep_out(MSG_process_self()); +#endif + MSG_RETURN(MSG_OK); +} + +/** \ingroup msg_gos_functions + * \brief Listen on \a channel and waits for receiving a task from \a host. + * + * It takes three parameters. + * \param task a memory location for storing a #m_task_t. It will + hold a task when this function will return. Thus \a task should not + be equal to \c NULL and \a *task should be equal to \c NULL. If one of + those two condition does not hold, there will be a warning message. + * \param channel the channel on which the agent should be + listening. This value has to be >=0 and < than the maximal + number of channels fixed with MSG_set_channel_number(). + * \param host the host that is to be watched. + * \return #MSG_FATAL if \a task is equal to \c NULL, #MSG_WARNING + if \a *task is not equal to \c NULL, and #MSG_OK otherwise. + */ +MSG_error_t +MSG_task_get_from_host(m_task_t * task, m_channel_t channel, m_host_t host) +{ + return MSG_task_get_ext(task, channel, -1, host); } /** \ingroup msg_gos_functions @@ -165,18 +291,18 @@ static MSG_error_t __MSG_task_get_with_time_out_from_host(m_task_t * task, * * It takes two parameters. * \param task a memory location for storing a #m_task_t. It will - hold a task when this function will return. Thus \a task should not - be equal to \c NULL and \a *task should be equal to \c NULL. If one of - those two condition does not hold, there will be a warning message. + hold a task when this function will return. Thus \a task should not + be equal to \c NULL and \a *task should be equal to \c NULL. If one of + those two condition does not hold, there will be a warning message. * \param channel the channel on which the agent should be - listening. This value has to be >=0 and < than the maximal - number of channels fixed with MSG_set_channel_number(). + listening. This value has to be >=0 and < than the maximal + number of channels fixed with MSG_set_channel_number(). * \return #MSG_FATAL if \a task is equal to \c NULL, #MSG_WARNING * if \a *task is not equal to \c NULL, and #MSG_OK otherwise. */ MSG_error_t MSG_task_get(m_task_t * task, m_channel_t channel) { - return MSG_task_get_with_time_out(task, channel, -1); + return MSG_task_get_with_timeout(task, channel, -1); } /** \ingroup msg_gos_functions @@ -184,333 +310,260 @@ MSG_error_t MSG_task_get(m_task_t * task, m_channel_t channel) * * It takes three parameters. * \param task a memory location for storing a #m_task_t. It will - hold a task when this function will return. Thus \a task should not - be equal to \c NULL and \a *task should be equal to \c NULL. If one of - those two condition does not hold, there will be a warning message. + hold a task when this function will return. Thus \a task should not + be equal to \c NULL and \a *task should be equal to \c NULL. If one of + those two condition does not hold, there will be a warning message. * \param channel the channel on which the agent should be - listening. This value has to be >=0 and < than the maximal - number of channels fixed with MSG_set_channel_number(). + listening. This value has to be >=0 and < than the maximal + number of channels fixed with MSG_set_channel_number(). * \param max_duration the maximum time to wait for a task before giving - up. In such a case, #MSG_TRANSFER_FAILURE will be returned, \a task - will not be modified and will still be - equal to \c NULL when returning. + up. In such a case, #MSG_TRANSFER_FAILURE will be returned, \a task + will not be modified and will still be + equal to \c NULL when returning. * \return #MSG_FATAL if \a task is equal to \c NULL, #MSG_WARNING - if \a *task is not equal to \c NULL, and #MSG_OK otherwise. + if \a *task is not equal to \c NULL, and #MSG_OK otherwise. */ -MSG_error_t MSG_task_get_with_time_out(m_task_t * task, - m_channel_t channel, - double max_duration) +MSG_error_t +MSG_task_get_with_timeout(m_task_t * task, m_channel_t channel, + double max_duration) { - return __MSG_task_get_with_time_out_from_host(task, channel, - max_duration, NULL); + return MSG_task_get_ext(task, channel, max_duration, NULL); } -/** \ingroup msg_gos_functions - * \brief Listen on \a channel and waits for receiving a task from \a host. - * - * It takes three parameters. - * \param task a memory location for storing a #m_task_t. It will - hold a task when this function will return. Thus \a task should not - be equal to \c NULL and \a *task should be equal to \c NULL. If one of - those two condition does not hold, there will be a warning message. - * \param channel the channel on which the agent should be - listening. This value has to be >=0 and < than the maximal - number of channels fixed with MSG_set_channel_number(). - * \param host the host that is to be watched. - * \return #MSG_FATAL if \a task is equal to \c NULL, #MSG_WARNING - if \a *task is not equal to \c NULL, and #MSG_OK otherwise. +/** \defgroup msg_gos_functions MSG Operating System Functions + * \brief This section describes the functions that can be used + * by an agent for handling some task. */ -MSG_error_t MSG_task_get_from_host(m_task_t * task, int channel, - m_host_t host) + +MSG_error_t +MSG_task_get_ext(m_task_t * task, m_channel_t channel, double timeout, + m_host_t host) +{ + xbt_assert1((channel >= 0) + && (channel < msg_global->max_channel), "Invalid channel %d", + channel); + + return + MSG_mailbox_get_task_ext(MSG_mailbox_get_by_channel + (MSG_host_self(), channel), task, host, + timeout); +} + +MSG_error_t +MSG_task_receive_from_host(m_task_t * task, const char *alias, + m_host_t host) +{ + return MSG_task_receive_ext(task, alias, -1, host); +} + +MSG_error_t MSG_task_receive(m_task_t * task, const char *alias) +{ + return MSG_task_receive_with_timeout(task, alias, -1); +} + +MSG_error_t +MSG_task_receive_with_timeout(m_task_t * task, const char *alias, + double timeout) +{ + return MSG_task_receive_ext(task, alias, timeout, NULL); +} + +MSG_error_t +MSG_task_receive_ext(m_task_t * task, const char *alias, double timeout, + m_host_t host) { - return __MSG_task_get_with_time_out_from_host(task, channel, -1, host); + DEBUG1 + ("MSG_task_receive_ext: Trying to receive a message on mailbox '%s'", + alias); + return MSG_mailbox_get_task_ext(MSG_mailbox_get_by_alias(alias), task, + host, timeout); } /** \ingroup msg_gos_functions - * \brief Test whether there is a pending communication on a channel. + * \brief Send a task on a channel. * - * It takes one parameter. - * \param channel the channel on which the agent should be - listening. This value has to be >=0 and < than the maximal - number of channels fixed with MSG_set_channel_number(). - * \return 1 if there is a pending communication and 0 otherwise + * This function takes two parameter. + * \param task a #m_task_t to send on another location. + * \param alias the channel on which the agent should put this + task. This value has to be >=0 and < than the maximal number of + channels fixed with MSG_set_channel_number(). + * \return the msg_comm_t communication. */ -int MSG_task_Iprobe(m_channel_t channel) +msg_comm_t MSG_task_isend(m_task_t task, const char *alias) { - m_host_t h = NULL; + simdata_task_t t_simdata = NULL; + m_process_t process = MSG_process_self(); + msg_mailbox_t mailbox = MSG_mailbox_get_by_alias(alias); - xbt_assert1((channel >= 0) - && (channel < msg_global->max_channel), "Invalid channel %d", - channel); CHECK_HOST(); - DEBUG2("Probing on channel %d (%s)", channel, h->name); + /* FIXME: these functions are not tracable */ + + /* Prepare the task to send */ + t_simdata = task->simdata; + t_simdata->sender = process; + t_simdata->source = MSG_host_self(); + + xbt_assert0(t_simdata->refcount == 1, + "This task is still being used somewhere else. You cannot send it now. Go fix your code!"); + + t_simdata->refcount++; + msg_global->sent_msg++; + process->simdata->waiting_task = task; + + /* Send it by calling SIMIX network layer */ - h = MSG_host_self(); - return (xbt_fifo_get_first_item(h->simdata->mbox[channel]) != NULL); + return SIMIX_req_comm_isend(mailbox, t_simdata->message_size, + t_simdata->rate, task, sizeof(void *), + &t_simdata->comm); } /** \ingroup msg_gos_functions - * \brief Test whether there is a pending communication on a channel, and who sent it. + * \brief Listen on a channel for receiving a task from an asynchronous communication. * - * It takes one parameter. - * \param channel the channel on which the agent should be - listening. This value has to be >=0 and < than the maximal - number of channels fixed with MSG_set_channel_number(). - * \return -1 if there is no pending communication and the PID of the process who sent it otherwise + * It takes two parameters. + * \param task a memory location for storing a #m_task_t. + * \param alias the channel on which the agent should be + listening. This value has to be >=0 and < than the maximal + number of channels fixed with MSG_set_channel_number(). + * \return the msg_comm_t communication. */ -int MSG_task_probe_from(m_channel_t channel) +msg_comm_t MSG_task_irecv(m_task_t * task, const char *alias) { - m_host_t h = NULL; - xbt_fifo_item_t item; - m_task_t t; + smx_rdv_t rdv = MSG_mailbox_get_by_alias(alias); - xbt_assert1((channel >= 0) - && (channel < msg_global->max_channel), "Invalid channel %d", - channel); CHECK_HOST(); - h = MSG_host_self(); + /* FIXME: these functions are not tracable */ - DEBUG2("Probing on channel %d (%s)", channel, h->name); + /* Sanity check */ + xbt_assert0(task, "Null pointer for the task storage"); - item = xbt_fifo_get_first_item(h->simdata->mbox[channel]); - if ((!item) || (!(t = xbt_fifo_get_item_content(item)))) - return -1; + if (*task) + CRITICAL0 + ("MSG_task_get() was asked to write in a non empty task struct."); - return MSG_process_get_PID(t->simdata->sender); + /* Try to receive it by calling SIMIX network layer */ + return SIMIX_req_comm_irecv(rdv, task, NULL); } /** \ingroup msg_gos_functions - * \brief Wait for at most \a max_duration second for a task reception - on \a channel. *\a PID is updated with the PID of the first process - that triggered this event if any. + * \brief Test the status of a communication. * - * It takes three parameters: - * \param channel the channel on which the agent should be - listening. This value has to be >=0 and < than the maximal. - number of channels fixed with MSG_set_channel_number(). - * \param PID a memory location for storing an int. - * \param max_duration the maximum time to wait for a task before - giving up. In the case of a reception, *\a PID will be updated - with the PID of the first process to send a task. - * \return #MSG_HOST_FAILURE if the host is shut down in the meantime - and #MSG_OK otherwise. + * It takes one parameter. + * \param comm the communication to test. + * \return the status of the communication: + * TRUE : the communication is completed + * FALSE: the communication is incompleted + * If the status is FALSE, don't forget to use MSG_process_sleep() after the test. */ -MSG_error_t MSG_channel_select_from(m_channel_t channel, - double max_duration, int *PID) +int MSG_comm_test(msg_comm_t comm) { - m_host_t h = NULL; - simdata_host_t h_simdata = NULL; - xbt_fifo_item_t item; - m_task_t t; - int first_time = 1; - smx_cond_t cond; - - xbt_assert1((channel >= 0) - && (channel < msg_global->max_channel), "Invalid channel %d", - channel); - if (PID) { - *PID = -1; - } - - if (max_duration == 0.0) { - *PID = MSG_task_probe_from(channel); - MSG_RETURN(MSG_OK); - } else { - CHECK_HOST(); - h = MSG_host_self(); - h_simdata = h->simdata; - - DEBUG2("Probing on channel %d (%s)", channel, h->name); - while (!(item = xbt_fifo_get_first_item(h->simdata->mbox[channel]))) { - if (max_duration > 0) { - if (!first_time) { - MSG_RETURN(MSG_OK); - } - } - SIMIX_mutex_lock(h_simdata->mutex); - xbt_assert1(!(h_simdata->sleeping[channel]), - "A process is already blocked on this channel %d", - channel); - cond = SIMIX_cond_init(); - h_simdata->sleeping[channel] = cond; /* I'm waiting. Wake me up when you're ready */ - if (max_duration > 0) { - SIMIX_cond_wait_timeout(cond, h_simdata->mutex, max_duration); - } else { - SIMIX_cond_wait(cond, h_simdata->mutex); - } - SIMIX_cond_destroy(cond); - SIMIX_mutex_unlock(h_simdata->mutex); - if (SIMIX_host_get_state(h_simdata->s_host) == 0) { - MSG_RETURN(MSG_HOST_FAILURE); - } - h_simdata->sleeping[channel] = NULL; - first_time = 0; - } - if (!item || !(t = xbt_fifo_get_item_content(item))) { - MSG_RETURN(MSG_OK); - } - if (PID) { - *PID = MSG_process_get_PID(t->simdata->sender); - } - MSG_RETURN(MSG_OK); - } + return SIMIX_req_comm_test(comm); } - /** \ingroup msg_gos_functions - - * \brief Return the number of tasks waiting to be received on a \a - channel and sent by \a host. + * \brief After received TRUE to MSG_comm_test(), the communication must be destroyed. * - * It takes two parameters. - * \param channel the channel on which the agent should be - listening. This value has to be >=0 and < than the maximal - number of channels fixed with MSG_set_channel_number(). - * \param host the host that is to be watched. - * \return the number of tasks waiting to be received on \a channel - and sent by \a host. + * It takes one parameter. + * \param comm the communication to destroy. */ -int MSG_task_probe_from_host(int channel, m_host_t host) +void MSG_comm_destroy(msg_comm_t comm) { - xbt_fifo_item_t item; - m_task_t t; - int count = 0; - m_host_t h = NULL; - - xbt_assert1((channel >= 0) - && (channel < msg_global->max_channel), "Invalid channel %d", - channel); - CHECK_HOST(); - h = MSG_host_self(); - - DEBUG2("Probing on channel %d (%s)", channel, h->name); - - xbt_fifo_foreach(h->simdata->mbox[channel], item, t, m_task_t) { - if (t->simdata->source == host) - count++; + if (SIMIX_req_comm_get_src_proc(comm) != SIMIX_process_self()) { + m_task_t task; + task = (m_task_t) SIMIX_req_comm_get_src_buff(comm); + task->simdata->refcount--; } - - return count; + SIMIX_req_comm_destroy(comm); } -/** \ingroup msg_gos_functions \brief Put a task on a channel of an - * host (with a timeout on the waiting of the destination host) and - * waits for the end of the transmission. +/** \ingroup msg_gos_functions + * \brief Wait for the completion of a communication. * - * This function is used for describing the behavior of an agent. It - * takes four parameter. - * \param task a #m_task_t to send on another location. This task - will not be usable anymore when the function will return. There is - no automatic task duplication and you have to save your parameters - before calling this function. Tasks are unique and once it has been - sent to another location, you should not access it anymore. You do - not need to call MSG_task_destroy() but to avoid using, as an - effect of inattention, this task anymore, you definitely should - renitialize it with #MSG_TASK_UNINITIALIZED. Note that this task - can be transfered iff it has been correctly created with - MSG_task_create(). - * \param dest the destination of the message - * \param channel the channel on which the agent should put this - task. This value has to be >=0 and < than the maximal number of - channels fixed with MSG_set_channel_number(). - * \param max_duration the maximum time to wait for a task before giving - up. In such a case, #MSG_TRANSFER_FAILURE will be returned, \a task - will not be modified - * \return #MSG_FATAL if \a task is not properly initialized and - #MSG_OK otherwise. Returns #MSG_HOST_FAILURE if the host on which - this function was called was shut down. Returns - #MSG_TRANSFER_FAILURE if the transfer could not be properly done - (network failure, dest failure, timeout...) + * It takes two parameters. + * \param comm the communication to wait. + * \param timeout Wait until the communication terminates or the timeout occurs + * \return MSG_error_t */ -MSG_error_t MSG_task_put_with_timeout(m_task_t task, m_host_t dest, - m_channel_t channel, - double max_duration) +MSG_error_t MSG_comm_wait(msg_comm_t comm, double timeout) { + xbt_ex_t e; + MSG_error_t res = MSG_OK; + TRY { + SIMIX_req_comm_wait(comm, timeout); + if (SIMIX_req_comm_get_src_proc(comm) != SIMIX_process_self()) { + m_task_t task; + task = (m_task_t) SIMIX_req_comm_get_src_buff(comm); + task->simdata->refcount--; + } - m_process_t process = MSG_process_self(); - simdata_task_t task_simdata = NULL; - m_host_t local_host = NULL; - m_host_t remote_host = NULL; - CHECK_HOST(); - - xbt_assert1((channel >= 0) - && (channel < msg_global->max_channel), "Invalid channel %d", - channel); - - task_simdata = task->simdata; - task_simdata->sender = process; - task_simdata->source = MSG_process_get_host(process); - xbt_assert0(task_simdata->using == 1, - "This task is still being used somewhere else. You cannot send it now. Go fix your code!"); - task_simdata->comm = NULL; - - local_host = ((simdata_process_t) process->simdata)->m_host; - remote_host = dest; - - DEBUG4("Trying to send a task (%g kB) from %s to %s on channel %d", - task->simdata->message_size / 1000, local_host->name, - remote_host->name, channel); - - SIMIX_mutex_lock(remote_host->simdata->mutex); - xbt_fifo_push(((simdata_host_t) remote_host->simdata)-> - mbox[channel], task); - - - if (remote_host->simdata->sleeping[channel]) { - DEBUG0("Somebody is listening. Let's wake him up!"); - SIMIX_cond_signal(remote_host->simdata->sleeping[channel]); + /* FIXME: these functions are not tracable */ } - SIMIX_mutex_unlock(remote_host->simdata->mutex); - - process->simdata->put_host = dest; - process->simdata->put_channel = channel; - SIMIX_mutex_lock(task->simdata->mutex); - // DEBUG4("Task sent (%g kB) from %s to %s on channel %d, waiting...", task->simdata->message_size/1000,local_host->name, remote_host->name, channel); - - process->simdata->waiting_task = task; - if (max_duration > 0) { - SIMIX_cond_wait_timeout(task->simdata->cond, task->simdata->mutex, - max_duration); - /* verify if the timeout happened and the communication didn't started yet */ - if (task->simdata->comm == NULL) { - task->simdata->using--; - process->simdata->waiting_task = NULL; - xbt_fifo_remove(((simdata_host_t) remote_host->simdata)-> - mbox[channel], task); - if (task->simdata->receiver) { - task->simdata->receiver->simdata->waiting_task = NULL; - } - task->simdata->sender = NULL; - SIMIX_mutex_unlock(task->simdata->mutex); - MSG_RETURN(MSG_TRANSFER_FAILURE); + CATCH(e) { + switch (e.category) { + case host_error: + res = MSG_HOST_FAILURE; + break; + case network_error: + res = MSG_TRANSFER_FAILURE; + break; + case timeout_error: + res = MSG_TIMEOUT; + break; + default: + xbt_die(bprintf("Unhandled SIMIX network exception: %s", e.msg)); } - } else { - SIMIX_cond_wait(task->simdata->cond, task->simdata->mutex); + xbt_ex_free(e); } + return res; +} - DEBUG1("Action terminated %s", task->name); - task->simdata->using--; - process->simdata->waiting_task = NULL; - /* the task has already finished and the pointer must be null */ - if (task->simdata->receiver) { - task->simdata->receiver->simdata->waiting_task = NULL; - /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */ - // task->simdata->comm = NULL; - //task->simdata->compute = NULL; +/** \ingroup msg_gos_functions +* \brief This function is called by a sender and permit to wait for each communication +* +* It takes three parameters. +* \param comm a vector of communication +* \param nb_elem is the size of the comm vector +* \param timeout for each call of MSG_comm_wait +*/ +void MSG_comm_waitall(msg_comm_t * comm, int nb_elem, double timeout) +{ + int i = 0; + for (i = 0; i < nb_elem; i++) { + MSG_comm_wait(comm[i], timeout); } - task->simdata->sender = NULL; - SIMIX_mutex_unlock(task->simdata->mutex); +} - if (SIMIX_action_get_state(task->simdata->comm) == SURF_ACTION_DONE) { - MSG_RETURN(MSG_OK); - } else if (SIMIX_host_get_state(local_host->simdata->s_host) == 0) { - MSG_RETURN(MSG_HOST_FAILURE); - } else { - MSG_RETURN(MSG_TRANSFER_FAILURE); - } +/** \ingroup msg_gos_functions +* \brief This function wait for the first completed communication +* +* It takes on parameter. +* \param comms a vector of communication +* \return the position of the completed communication from the xbt_dynar_t. +*/ +int MSG_comm_waitany(xbt_dynar_t comms) +{ + return SIMIX_req_comm_waitany(comms); +} + +/** \ingroup msg_gos_functions +* \brief This function wait for the first completed communication +* +* It takes on parameter. +* \param comms a vector of communication +* \return the position of the completed communication, if any, or -1 if none was completed +*/ +int MSG_comm_testany(xbt_dynar_t comms) +{ + return SIMIX_req_comm_testany(comms); +} + +m_task_t MSG_comm_get_task(msg_comm_t comm) +{ + xbt_assert0(comm, "Invalid parameters"); + return (m_task_t) SIMIX_req_comm_get_src_buff(comm); } /** \ingroup msg_gos_functions @@ -520,19 +573,19 @@ MSG_error_t MSG_task_put_with_timeout(m_task_t task, m_host_t dest, * This function is used for describing the behavior of an agent. It * takes three parameter. * \param task a #m_task_t to send on another location. This task - will not be usable anymore when the function will return. There is - no automatic task duplication and you have to save your parameters - before calling this function. Tasks are unique and once it has been - sent to another location, you should not access it anymore. You do - not need to call MSG_task_destroy() but to avoid using, as an - effect of inattention, this task anymore, you definitely should - renitialize it with #MSG_TASK_UNINITIALIZED. Note that this task - can be transfered iff it has been correctly created with - MSG_task_create(). + will not be usable anymore when the function will return. There is + no automatic task duplication and you have to save your parameters + before calling this function. Tasks are unique and once it has been + sent to another location, you should not access it anymore. You do + not need to call MSG_task_destroy() but to avoid using, as an + effect of inattention, this task anymore, you definitely should + renitialize it with #MSG_TASK_UNINITIALIZED. Note that this task + can be transfered iff it has been correctly created with + MSG_task_create(). * \param dest the destination of the message * \param channel the channel on which the agent should put this - task. This value has to be >=0 and < than the maximal number of - channels fixed with MSG_set_channel_number(). + task. This value has to be >=0 and < than the maximal number of + channels fixed with MSG_set_channel_number(). * \return #MSG_FATAL if \a task is not properly initialized and * #MSG_OK otherwise. Returns #MSG_HOST_FAILURE if the host on which * this function was called was shut down. Returns @@ -545,256 +598,188 @@ MSG_error_t MSG_task_put(m_task_t task, m_host_t dest, m_channel_t channel) } /** \ingroup msg_gos_functions - * \brief Does exactly the same as MSG_task_put but with a bounded transmition + * \brief Does exactly the same as MSG_task_put but with a bounded transmition * rate. * * \sa MSG_task_put */ -MSG_error_t MSG_task_put_bounded(m_task_t task, - m_host_t dest, m_channel_t channel, - double max_rate) +MSG_error_t +MSG_task_put_bounded(m_task_t task, m_host_t dest, m_channel_t channel, + double maxrate) { - MSG_error_t res = MSG_OK; - task->simdata->rate = max_rate; - res = MSG_task_put(task, dest, channel); - return (res); + task->simdata->rate = maxrate; + return MSG_task_put(task, dest, channel); } -/** \ingroup msg_gos_functions - * \brief Executes a task and waits for its termination. +/** \ingroup msg_gos_functions \brief Put a task on a channel of an + * host (with a timeout on the waiting of the destination host) and + * waits for the end of the transmission. * * This function is used for describing the behavior of an agent. It - * takes only one parameter. - * \param task a #m_task_t to execute on the location on which the - agent is running. + * takes four parameter. + * \param task a #m_task_t to send on another location. This task + will not be usable anymore when the function will return. There is + no automatic task duplication and you have to save your parameters + before calling this function. Tasks are unique and once it has been + sent to another location, you should not access it anymore. You do + not need to call MSG_task_destroy() but to avoid using, as an + effect of inattention, this task anymore, you definitely should + renitialize it with #MSG_TASK_UNINITIALIZED. Note that this task + can be transfered iff it has been correctly created with + MSG_task_create(). + * \param dest the destination of the message + * \param channel the channel on which the agent should put this + task. This value has to be >=0 and < than the maximal number of + channels fixed with MSG_set_channel_number(). + * \param timeout the maximum time to wait for a task before giving + up. In such a case, #MSG_TRANSFER_FAILURE will be returned, \a task + will not be modified * \return #MSG_FATAL if \a task is not properly initialized and - * #MSG_OK otherwise. +#MSG_OK otherwise. Returns #MSG_HOST_FAILURE if the host on which +this function was called was shut down. Returns +#MSG_TRANSFER_FAILURE if the transfer could not be properly done +(network failure, dest failure, timeout...) */ -MSG_error_t MSG_task_execute(m_task_t task) +MSG_error_t +MSG_task_put_with_timeout(m_task_t task, m_host_t dest, + m_channel_t channel, double timeout) { - simdata_task_t simdata = NULL; - m_process_t self = MSG_process_self(); - CHECK_HOST(); - - simdata = task->simdata; - xbt_assert0((!simdata->compute) && (task->simdata->using == 1), - "This task is executed somewhere else. Go fix your code!"); - - DEBUG1("Computing on %s", MSG_process_self()->simdata->m_host->name); - simdata->using++; - SIMIX_mutex_lock(simdata->mutex); - simdata->compute = - SIMIX_action_execute(SIMIX_host_self(), task->name, - simdata->computation_amount); - SIMIX_action_set_priority(simdata->compute, simdata->priority); - - self->simdata->waiting_task = task; - SIMIX_register_action_to_condition(simdata->compute, simdata->cond); - SIMIX_cond_wait(simdata->cond, simdata->mutex); - self->simdata->waiting_task = NULL; - - SIMIX_mutex_unlock(simdata->mutex); - simdata->using--; + xbt_assert1((channel >= 0) + && (channel < msg_global->max_channel), "Invalid channel %d", + channel); - if (SIMIX_action_get_state(task->simdata->compute) == SURF_ACTION_DONE) { - /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */ - SIMIX_action_destroy(task->simdata->compute); - simdata->computation_amount = 0.0; - simdata->comm = NULL; - simdata->compute = NULL; - MSG_RETURN(MSG_OK); - } else if (SIMIX_host_get_state(SIMIX_host_self()) == 0) { - /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */ - SIMIX_action_destroy(task->simdata->compute); - simdata->comm = NULL; - simdata->compute = NULL; - MSG_RETURN(MSG_HOST_FAILURE); - } else { - /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */ - SIMIX_action_destroy(task->simdata->compute); - simdata->comm = NULL; - simdata->compute = NULL; - MSG_RETURN(MSG_TASK_CANCELLED); - } + DEBUG1("MSG_task_put_with_timout: Trying to send a task to '%s'", dest->name); + return + MSG_mailbox_put_with_timeout(MSG_mailbox_get_by_channel + (dest, channel), task, timeout); } - -/** \ingroup m_task_management - * \brief Creates a new #m_task_t (a parallel one....). - * - * A constructor for #m_task_t taking six arguments and returning the - corresponding object. - * \param name a name for the object. It is for user-level information - and can be NULL. - * \param host_nb the number of hosts implied in the parallel task. - * \param host_list an array of \p host_nb m_host_t. - * \param computation_amount an array of \p host_nb - doubles. computation_amount[i] is the total number of operations - that have to be performed on host_list[i]. - * \param communication_amount an array of \p host_nb* \p host_nb doubles. - * \param data a pointer to any data may want to attach to the new - object. It is for user-level information and can be NULL. It can - be retrieved with the function \ref MSG_task_get_data. - * \see m_task_t - * \return The new corresponding object. - */ -m_task_t MSG_parallel_task_create(const char *name, - int host_nb, - const m_host_t * host_list, - double *computation_amount, - double *communication_amount, void *data) +MSG_error_t MSG_task_send(m_task_t task, const char *alias) { - int i; - simdata_task_t simdata = xbt_new0(s_simdata_task_t, 1); - m_task_t task = xbt_new0(s_m_task_t, 1); - task->simdata = simdata; + DEBUG1("MSG_task_send: Trying to send a message on mailbox '%s'", alias); + return MSG_task_send_with_timeout(task, alias, -1); +} - /* Task structure */ - task->name = xbt_strdup(name); - task->data = data; - /* Simulator Data */ - simdata->computation_amount = 0; - simdata->message_size = 0; - simdata->cond = SIMIX_cond_init(); - simdata->mutex = SIMIX_mutex_init(); - simdata->compute = NULL; - simdata->comm = NULL; - simdata->rate = -1.0; - simdata->using = 1; - simdata->sender = NULL; - simdata->receiver = NULL; - simdata->source = NULL; +MSG_error_t +MSG_task_send_bounded(m_task_t task, const char *alias, double maxrate) +{ + task->simdata->rate = maxrate; + return MSG_task_send(task, alias); +} - simdata->host_nb = host_nb; - simdata->host_list = xbt_new0(void *, host_nb); - simdata->comp_amount = computation_amount; - simdata->comm_amount = communication_amount; - for (i = 0; i < host_nb; i++) - simdata->host_list[i] = host_list[i]->simdata->s_host; +MSG_error_t +MSG_task_send_with_timeout(m_task_t task, const char *alias, + double timeout) +{ + return MSG_mailbox_put_with_timeout(MSG_mailbox_get_by_alias(alias), + task, timeout); +} - return task; +int MSG_task_listen(const char *alias) +{ + CHECK_HOST(); + return !MSG_mailbox_is_empty(MSG_mailbox_get_by_alias(alias)); } - -MSG_error_t MSG_parallel_task_execute(m_task_t task) +/** \ingroup msg_gos_functions + * \brief Test whether there is a pending communication on a channel. + * + * It takes one parameter. + * \param channel the channel on which the agent should be + listening. This value has to be >=0 and < than the maximal + number of channels fixed with MSG_set_channel_number(). + * \return 1 if there is a pending communication and 0 otherwise + */ +int MSG_task_Iprobe(m_channel_t channel) { - simdata_task_t simdata = NULL; - m_process_t self = MSG_process_self(); + xbt_assert1((channel >= 0) + && (channel < msg_global->max_channel), "Invalid channel %d", + channel); + CHECK_HOST(); - simdata = task->simdata; - xbt_assert0((!simdata->compute) && (task->simdata->using == 1), - "This task is executed somewhere else. Go fix your code!"); + return + !MSG_mailbox_is_empty(MSG_mailbox_get_by_channel + (MSG_host_self(), channel)); +} - xbt_assert0(simdata->host_nb, - "This is not a parallel task. Go to hell."); +/** \ingroup msg_gos_functions - DEBUG1("Computing on %s", MSG_process_self()->simdata->m_host->name); - simdata->using++; - SIMIX_mutex_lock(simdata->mutex); - simdata->compute = - SIMIX_action_parallel_execute(task->name, simdata->host_nb, - simdata->host_list, - simdata->comp_amount, - simdata->comm_amount, 1.0, -1.0); + * \brief Return the number of tasks waiting to be received on a \a + channel and sent by \a host. + * + * It takes two parameters. + * \param channel the channel on which the agent should be + listening. This value has to be >=0 and < than the maximal + number of channels fixed with MSG_set_channel_number(). + * \param host the host that is to be watched. + * \return the number of tasks waiting to be received on \a channel + and sent by \a host. + */ +int MSG_task_probe_from_host(int channel, m_host_t host) +{ + xbt_assert1((channel >= 0) + && (channel < msg_global->max_channel), "Invalid channel %d", + channel); - self->simdata->waiting_task = task; - SIMIX_register_action_to_condition(simdata->compute, simdata->cond); - SIMIX_cond_wait(simdata->cond, simdata->mutex); - self->simdata->waiting_task = NULL; + CHECK_HOST(); + return + MSG_mailbox_get_count_host_waiting_tasks(MSG_mailbox_get_by_channel + (MSG_host_self(), channel), + host); - SIMIX_mutex_unlock(simdata->mutex); - simdata->using--; +} - if (SIMIX_action_get_state(task->simdata->compute) == SURF_ACTION_DONE) { - /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */ - SIMIX_action_destroy(task->simdata->compute); - simdata->computation_amount = 0.0; - simdata->comm = NULL; - simdata->compute = NULL; - MSG_RETURN(MSG_OK); - } else if (SIMIX_host_get_state(SIMIX_host_self()) == 0) { - /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */ - SIMIX_action_destroy(task->simdata->compute); - simdata->comm = NULL; - simdata->compute = NULL; - MSG_RETURN(MSG_HOST_FAILURE); - } else { - /* action ended, set comm and compute = NULL, the actions is already destroyed in the main function */ - SIMIX_action_destroy(task->simdata->compute); - simdata->comm = NULL; - simdata->compute = NULL; - MSG_RETURN(MSG_TASK_CANCELLED); - } +int MSG_task_listen_from_host(const char *alias, m_host_t host) +{ + CHECK_HOST(); + return + MSG_mailbox_get_count_host_waiting_tasks(MSG_mailbox_get_by_alias + (alias), host); } - /** \ingroup msg_gos_functions - * \brief Sleep for the specified number of seconds - * - * Makes the current process sleep until \a time seconds have elapsed. + * \brief Test whether there is a pending communication on a channel, and who sent it. * - * \param nb_sec a number of second + * It takes one parameter. + * \param channel the channel on which the agent should be + listening. This value has to be >=0 and < than the maximal + number of channels fixed with MSG_set_channel_number(). + * \return -1 if there is no pending communication and the PID of the process who sent it otherwise */ -MSG_error_t MSG_process_sleep(double nb_sec) +int MSG_task_probe_from(m_channel_t channel) { - smx_action_t act_sleep; - m_process_t proc = MSG_process_self(); - smx_mutex_t mutex; - smx_cond_t cond; - /* create action to sleep */ - act_sleep = - SIMIX_action_sleep(SIMIX_process_get_host(proc->simdata->s_process), - nb_sec); - - mutex = SIMIX_mutex_init(); - SIMIX_mutex_lock(mutex); - /* create conditional and register action to it */ - cond = SIMIX_cond_init(); - - SIMIX_register_action_to_condition(act_sleep, cond); - SIMIX_cond_wait(cond, mutex); - SIMIX_mutex_unlock(mutex); - - /* remove variables */ - SIMIX_cond_destroy(cond); - SIMIX_mutex_destroy(mutex); - - if (SIMIX_action_get_state(act_sleep) == SURF_ACTION_DONE) { - if (SIMIX_host_get_state(SIMIX_host_self()) == SURF_CPU_OFF) { - SIMIX_action_destroy(act_sleep); - MSG_RETURN(MSG_HOST_FAILURE); - } - } else { - SIMIX_action_destroy(act_sleep); - MSG_RETURN(MSG_HOST_FAILURE); - } + m_task_t task; + CHECK_HOST(); - MSG_RETURN(MSG_OK); -} + xbt_assert1((channel >= 0) + && (channel < msg_global->max_channel), "Invalid channel %d", + channel); -/** \ingroup msg_gos_functions - * \brief Return the number of MSG tasks currently running on - * the host of the current running process. - */ -static int MSG_get_msgload(void) -{ - xbt_die("not implemented yet"); - return 0; + if (NULL == + (task = + MSG_mailbox_get_head(MSG_mailbox_get_by_channel + (MSG_host_self(), channel)))) + return -1; + + return MSG_process_get_PID(task->simdata->sender); } -/** \ingroup msg_gos_functions - * - * \brief Return the last value returned by a MSG function (except - * MSG_get_errno...). - */ -MSG_error_t MSG_get_errno(void) +int MSG_task_listen_from(const char *alias) { - return PROCESS_GET_ERRNO(); + m_task_t task; + + CHECK_HOST(); + + if (NULL == + (task = MSG_mailbox_get_head(MSG_mailbox_get_by_alias(alias)))) + return -1; + + return MSG_process_get_PID(task->simdata->sender); }